ESLint complains when using export names from package.json

[esheyw]

Trying to do

import type { T } from "fvtt-types/utils"
// or
import "fvtt-types/worker"

makes ESLint complain about the lack of extension, necessitating a // eslint-disable-next-line import/extensions. I'm not sure what effects disabling the rule might have on the rest of the repo, if any, but it should be considered if we're going to be using the export names more.